#include<stdio.h>
#include<math.h>
void swap(int* pa, int* pb)
{

	int z = 0;
	z = *pa;
	*pa = *pb;
	*pb = z;

}
int main()
{
	int a = 10;
	int b = 20;
	printf("a=%d,b=%d\n", a, b);
	swap(&a, &b);
	printf("a=%d,b=%d", a, b);


	return 0;
}